I built a Warmoth Evertune guitar once and while I really loved that it was staying in tune for months without having to reach for the tuners, I really thought there was two major downsides to this system after using it for a while:
1. Lack of sustain on higher notes, and somewheat thin tone
This is quite obvious, and something that I was totally ready to foresee, since my guitar was mainly built for rhythm guitar recordings (I use a fair deal of Floyd Rose divebombs and stuff in solos). Thin tone must have been because it doesn't have any real contact with the body. I had EMG 81 in three guitars, one Les Paul, one Warmoth with Floyd Rose and also in the Evertune guitar; the Les Paul sounded full and punchy, the Floyd Rose was a bit thinner, and then Evertune sounded really thin. And this was EMGs ; they do NOT make all guitars sound the same.
2. The intonation is too good
Now this is the real deal breaker! A properly setup hardtail/floyd guitar sounds different (worse) than the Evertune in comparison. The Evertune intonates too well, actually. And for me, that's no a good thing. And that's because I really like my Floyd Rose guitars and my regular hardtail bass... But it sounded different to those.
BUT STILL I'M TEMPTED TO GET MYSELF ANOTHER EVERTUNE GUITAR! And that's because the tuning stability.
I come VERY close with Tremol-No on my Floyd Rose guitar, with that it holds perfect tune for a very long time, but I still don't think it's perfect.
Anybody else who can show an A/B comparison with Evertune vs hardtail/Floyd Rose guitar done with Kemper?
But the intonation issue still remains... Gah!!!